Thermarest Questar™ Ultralight Down - Mummy Sleeping Bag (0F to -18C)It's not weightless, but the Questar feels pretty darn close. The cold weather winter sleeping bag in Therm a Rests top rated and award winning Questar line of warm and packable down backpacking bags 650 fill Nikwax Hydrophobic Down absorbs 90% less water and dries 3 times faster without using dangerous PFCs With Additional Room for Multiple positions (W. A. R. M.) fit means it allows for various natural sleep positions while maintaining thermal